Dome-fastener.



L. L. MARTIN.

DOME FASTENER.

APPLICATION FILED DEC.H,19I6.

1361,8355, Patented Apr. 9, 1918.

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LOUIS L. .NEAETIN, 0F TORONTO, ONTARIO, CANADA.

DOME-FASTENEE.

To all whom it may concern.

Be it known that 1, Louis L. MARTIN, a subject of the King of Great Britain. and resident of the city of 'lforonto county. of York, Province of Ontario, in the Dominion of Canada, have invented certain new and useful Improvements in Dome-Fasteners, described inthe following specification and illustrated in the accompanyin drawings, that form part of the same.

T he principal objects of the invention are to so improve the construction that the fasteners will hold securely and the annoyances due to the unfastening of such devices will be obviated.

A further object is to devise a fastener which while holding securely may be fastened or unfastened very easily and without strain upon the fabric to which it is secured, thereby obviating the tearing of garments made of fine fabrics.

The principal feature of the invention consists in the novel formation of the members whereby the headed member is adapted to enter atone end of a converging slot in the other member and is retained at the narrow end with the head portion overlapping the sides of the slot by spring contact memhere.

In the drawings, Figure 1 is a perspective view of the headed member of the fastening.

Fig. 2 is a perspective view of the slotted member.

Fig. 3 is a perspective view showing the two members in locked engagement.

Fig. 4 is a vertical sectional view through the members as shown in Fi g. 3, the section being taken through the slot.

Fig. 5 is a section through the slotted plate taken longitudinally of the slot.

Fig. 6 is a plan view of the slotted plate showing the relative position of the head of the other member locked in place in a locked position.

Like numerals of reference indicate corresponding parts in each figure.

In the use of dome fasteners which are applied so extensively to light flimsy fabrics it is commonly known that one of the greatest difficulties in connection with their use is that if a fastener of the present known types is made strong enough to hold the garment together the resistance to separating the parts when it is desired to unfasten the garment is such that frequent tearing of the fabric occurs.

Specification of Letters Patent.

It is also well known inthe existing types of dome fasteners that the securing of the members is dependent upon spring contacts and these sprin contacts on account of their extremely small dimensions vary a great deal and many of them are too weak to hold the garment secure and othersare so stiff-- as to cause tearing.

These difiiculties are obviated in the present construction in which the plate 1 is end 3 of which is of sutficient size to admit the head a of the other fastener member 5 and when the shank 6 is moved into the narrower portion of the slot the under side of the head will engage the upper surface of the plate each side of the slot and hold the members securely together.

This feature in respect to fastening tw members together is not new but in the present construction the plate 1 is formed with the slits 7 at-each side of the converging slot 2, thereby dividing the plate so that the metal each side of the slot 2 forms two narrow ribbons 8. T he metal of the ribbons 8 is stretched upwardly at 9 at each side of the slot adjacent to the enlarged end 3 and forms a pair of spring humps which engage the underside of the head i and hold said head in the inward position within the tapering slot effectively preventing its accidental withdrawal. The humps 9 are not however too high to prevent their being sprung downwardly quite easily when it is desired to separate the two members of the fastening, a. slight endwise pull being suflicient to draw the head l longitudinally in the slot 2 past the humps 9 to the enlarged end, whereupon. the members will readily separate.

It may be found desirable to provide efli cient means for preventing longitudinal slip and I have shown the plate 2 formed with downward indents or depressions 1O arranged atthe outer sides of the slits 7 and diametrically opposite and in line with the center of the smaller end of the slot which forms the center of the plate. The plate 5 is here shown with a radiating corrugated surface 11 surrounding the'stem which the downwardly projecting detents formed by the indents 10 engage. The plates 1 and 5 are preferably formed with a reinforcing rib 12 at the outer edge to stiffen them and also to obviate the sharp edges which would be liable to cut the fabric to which they are secured. Suitable stitching holes are ar y Patented Apr. 9, 1918. Application filed; December 11, 1916. Serial No. 136,188.

formed with a convergent slot 2, the larger ranged in the plates for securing them to the fabric.

What I claim as my invention is:

1. A dome fastener, comprising, a plate formed with a headed projection and corrugations at the base of said head, and a plate formed with a convergent slot adapted to receive said headed projection 'and'having downwardly projecting detents adapted to engage the corrugated surface of the other plate to hold the headed projection at the narrow end of the slot.

2. A dome fastener, comprising, a plate formed with a headed projection and corrugations at the base of said head, and a plate formed with a convergent sl'otia'dapted to receive. said headed projection and having formed with a headed projection and cor-' rugations-at the base of said head, and a plate formed with a convergent slot adapted to receivesaid head'ed'proj'ection and having downwardly projecting spring 'detents arranged at the sides or the convergent slot adjacent to the smaller end and adapted to engage the corrugated surface of the other plate.

LOUIS L. MARTIN.

Copies of this patent may be obtained 'ior'five cents each, by addressing-the Commissioner ofratencs,

v Washington, D. 0; 

